The 2004–05 Top 16 season was the top level of French club rugby in 2004–05.

It was the final season under the 16 club format, as the competition became the Top 14 for the 2005–06 season.

Biarritz Olympique won the championship, defeating Stade Français Paris in the final at Stade de France.

FC Grenoble, Béziers and Auch were relegated to Rugby Pro D2 after the 2004–05 season.